CVE-2020-13901Public exploitNetwork attack vector

Server crash via misbounded SDP identifier concatenation

Published Jun 10, 2020 · Updated Aug 4, 2024

Stack-based buffer overflow in Meetecho Janus WebRTC Server 0.10.0 and earlier allows remote attackers to crash the server via crafted SDP. The janus_sdp_merge function appends audio, video, and data media identifiers to a fixed stack buffer while passing JANUS_BUFSIZE rather than the buffer's actual size to g_strlcat. No authentication or user interaction is required; a crafted session negotiation can overwrite stack memory and terminate the network-facing process.

CVSS severity9.8
Critical
EPSS probability2.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Meetecho Janus WebRTC Server 0.10.0 and earlier allows remote attackers to crash the server via crafted SDP. The janus_sdp_merge function appends audio, video, and data media identifiers to a fixed stack buffer while passing JANUS_BUFSIZE rather than the buffer's actual size to g_strlcat. No authentication or user interaction is required; a crafted session negotiation can overwrite stack memory and terminate the network-facing process.

The record

CVE
CVE-2020-13901
Published
Jun 10, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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